KR20160143969A

KR20160143969A - Spectroscopic instrument using plane mirror and lens

Info

Publication number: KR20160143969A
Application number: KR1020150079846A
Authority: KR
Inventors: 김주현; 손승희; 김방엽; 이주희
Original assignee: 한국항공우주연구원
Priority date: 2015-06-05
Filing date: 2015-06-05
Publication date: 2016-12-15

Abstract

The performance enhancement spectroscope using the planar mirror and the lens according to the present invention comprises an entrance lens unit composed of a single or a plurality of spherical and aspherical lenses to disperse transmitted light; A plane mirror that primarily reflects the light scattered and transmitted from the entrance lens unit; A diffraction grating for obtaining a spectrum by dividing light transmitted through the plane mirror into a plurality of wavelength bands; And an exit lens unit that receives the light divided by the wavelength band passing through the diffraction grating to converge the secondary reflected light when the plane mirror is secondarily reflected. In the case where the first reflection and the second reflection occur on the same plane By utilizing a single mirror, it is possible to eliminate the factors of astigmatism caused by the tilting of the spherical mirror, so that the image is clearly formed.

Description

[0001] SPECTROSCOPIC INSTRUMENT USING PLANE MIRROR AND LENS [0002]

The present invention relates to a performance improvement spectroscope using a planar mirror and a lens. More particularly, the present invention relates to an apparatus for analyzing physicochemical properties of a target object, such as a hyperspectral imager, a spectrometer, and a monochrometer, The optical system of a series of spectroscopic equipments has been improved by improving the parts related to aberrations in the conventional system, and thus the optical system generated by the inclination of the curved surface occurring in the Czerny-Turner system or the Offner system, And a performance improvement spectroscope using a planar mirror and a lens that can enhance optical performance by minimizing aberration.

The spectroscope is a device for measuring the chemical and physical properties of a measurement object by dispersing the light according to wavelength using a diffraction grating, a prism, a filter, or the like.

The spectroscope is basically the same as that of a monochromator for measuring the light intensity of a specific wavelength. The monochromator using the diffraction grating includes a Czerny-Turner system, an Ebert-Fastie system, Monk-Gillieson type and Offner type, etc. Czerny-Turner type and Offner type which have simple optical structure and good optical performance are mainly used.

The conventional methods described above use a large curved surface (curved mirror), or a method in which a small curved surface is tilted, and in the case of a curved surface, a single or a plurality of curved surfaces are utilized to improve aberration. There is a problem that it is difficult to improve the aberration as compared with a case where a lens is used in combination.

Also, in the conventional spectroscope systems described above, the focal plane according to the optical path changes due to the tilting of the curved surface, so that optical aberrations such as astigmatism and distortion can be generated more than tilting the plane mirror.

Korean Patent Publication No. 10-2010-0018742 (2010. 02. 18)

In order to overcome the above-described problems, the present invention uses a single or two planar mirrors for changing the optical path, thereby making it easier to align the optical element than the optical path change by the conventional spherical mirror, The objective of the present invention is to provide a performance improving spectroscope using planar mirrors and lenses capable of eliminating generation of aberrations and distortion of other optical systems.

According to an aspect of the present invention, there is provided a spectrometer for improving performance using a planar mirror and a lens, comprising: an entrance lens unit composed of a single or a plurality of spherical and aspherical lenses to disperse transmitted light; A plane mirror for primarily reflecting the light scattered and transmitted from the entrance lens unit; A diffraction grating for obtaining a spectrum by dividing the light reflected by the plane mirror into the wavelength ranges; And an exit lens unit that receives the light divided by the wavelength band passing through the diffraction grating to converge the second reflected light when the plane mirror is reflected twice.

Preferably, in order to achieve the above object, the planar mirror of the performance improving spectroscope using the planar mirror and the lens according to the present invention is characterized in that a single or two planar mirrors are provided, and one or more lenses are included .

More preferably, the entrance lens unit of the performance improvement spectroscope using the planar mirror and the lens according to the present invention minimizes the numerical value according to the spectral characteristics such as a concave lens, a convex lens, an aspheric lens, a fluorite lens, etc. A plurality of lenses having various refractive indices can be combined into a single lens or a plurality of lenses.

The entrance lens unit, which is called a collimator, is combined as described above to make the transmitted light into parallel light and project it onto the diffraction grating.

The exit lens unit may have a lens having various refractive indices combined with a single lens or a plurality of lenses so as to minimize aberration according to characteristics of a spectroscope such as a concave lens, a convex lens, an aspherical lens, And converges the light transmitted through the lens to a detecting element (detector) or a film or the like.

The performance enhancement spectroscope using the planar mirror and the lens according to the present invention uses a single or two planar mirrors to change the optical path, thereby changing the optical path using the existing spherical mirror, or a method of forming a collimator or a phase The aberration and distortion of the generated optical system can be minimized and the image can be clearly formed.

Figure 1 shows the principle of conventional spectroscopes, and
2 is a view showing the principle of a performance improving spectroscope using a planar mirror and a lens according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary meanings, and the inventor should properly interpret the concept of the term to describe its own invention in the best way. The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing the principle of a performance improving spectroscope using a planar mirror and a lens according to the present invention.

1, the performance improving spectroscope using a planar mirror and a lens according to the present invention includes an entrance lens unit 100, a plane mirror 200, a diffraction grating 300, and an exit lens unit 400 .

The entrance lens unit 100 is composed of a single or a plurality of spherical and aspherical lenses. More specifically, the entrance lens unit 100 includes a concave lens 110, a convex lens 120, and an aspherical lens 130, Are combined to disperse the transmitted light.

The plane mirror 200 is provided as a planar mirror and reflects the light transmitted through the entrance lens unit 100 to the diffraction grating 300.

The diffraction grating 300 can obtain a spectrum by transmitting or reflecting the light reflected through the plane mirror 200 and dividing the reflected light by the wavelength.

More specifically, the diffraction grating 300 is formed by disposing a large number of slits on a flat glass or a concave metal plate at equal intervals and making a large number of slits. Light is incident on the diffraction grating 300 to transmit or reflect the light, To obtain a spectrum.

And transmits the light divided by the wavelength through the diffraction grating 300 to the plane mirror 200 so that secondary reflection occurs.

The exit lens unit 400 includes a lens having various refractive indices such as an aspherical lens 430, a convex lens 420 and a concave lens 410 in combination with the entrance lens unit 100, And the second reflected light is converged to a specific focus.

As described above, the performance enhancement spectroscope using the planar mirror and the lens according to the present invention uses the single or two planar mirrors 200 to change the optical path, so that the alignment of the optical elements is easier than the optical path change by the spherical mirror, The astigmatism due to the tilting of the spherical surface (a phenomenon in which the light from one point does not converge to one point when the lens or mirror forms an image), and the phenomenon that the image is blurred or distorted can be eliminated.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It is to be understood that various modifications and changes may be made without departing from the scope of the appended claims.

100: entrance lens section
110: concave lens
120: convex lens
130: Aspheric lens
200:
300: diffraction grating
400: exit lens section
410: concave lens
420: convex lens
430: Aspheric lens

Claims

An entrance lens unit 100 composed of a single or a plurality of spherical and aspherical lenses having different refractive indices and dispersing the transmitted light;
A planar mirror 200 for primarily reflecting light transmitted and dispersed in the entrance lens unit 100;
A diffraction grating 300 for obtaining a spectrum by dividing light transmitted through the plane mirror 200 by wavelengths; And
And an exit lens unit 400 that receives the light divided by the wavelength band passing through the diffraction grating 300 and converges the secondary reflected light when the plane mirror 200 is reflected twice. Performance improvement spectroscope using planar mirrors and lenses.

The method according to claim 1,
The plane mirror 200
Characterized in that a single or two flat mirrors are provided.

The method according to claim 1,
The entrance lens unit 100 includes:
The concave lens 110, the convex lens 120, and the aspherical lens 130 having different refractive indices based on the traveling direction of light are arranged and arranged so that the arrangement or aberration is minimized in order to disperse the transmitted light Performance spectroscope using planar mirrors and lenses.

The method according to claim 1,
The exit lens unit 400
The aspherical lens 430, the convex lens 420 and the concave lens 410 having different refractive indices based on the traveling direction of the light are arranged in combination so as to minimize the arrangement or aberration in order to converge the transmitted light Performance enhanced spectroscope using planar mirrors and lenses.